[Elecraft] K3S & 2m Internal Transverter Calibration Problem Using External Reference

[Henk de Vries]

Hi John,




In case you are only interested in 2 meters you can and have an accurate readout on the band


Be aware that all hf + 6m will shift as well and will no longer be accurate.


73 Henk




Henk







On Tue, Aug 11, 2020 at 8:28 PM +0200, "John Stengrevics" <jstengrevics at comcast.net> wrote:










Hi Henk,
Thanks for that info.  That does make me think I could adjust the offset on the Config menu to account for the 800 Hz, no?
73,
JohnWA1EAZ

On Aug 11, 2020, at 2:18 PM, Henk de Vries <hdv at kpnplanet.nl> wrote:
Hi john,




Correction of the frequency for HF/6 takes place at synthesizer/DSP level (Elecraft has not answered my questions where exactly) and takes the frequency deviation of the main TCXO into account. So this does not correct the TCXO itself.




The 2 meter K144RFLK locks directly to the main TCXO. As said, this frequency cannot be corrected. 




The 2 meter transverter does not "communicate" with the rest of the K3 as well so no correction on synthesizer/DSP level takes place and any TCXO frequency deviation will show up on 2 meters.


The 800 Hz cannot be corrected.




You could change the TCXO by a more accurate one.




73 Henk


PA0C




Henk







On Tue, Aug 11, 2020 at 2:21 PM +0200, "John Stengrevics" <jstengrevics at comcast.net> wrote:










I am using an external reference to lock the K3S' frequency.  The resulting frequency is 100% accurate on the low bands and on 6 meters.  However, on 2 meters, the frequency is approximately 800 Hz low.

The manual states that using an external reference will lock the frequency but that it will be somewhat less accurate (not 800 Hz less accurate).  There is no procedure given for calibration with an external reference oscillator.

I suppose I could play with the offset, but that seems hit or miss.  I would appreciate any suggestions.

73,

John
WA1EAZ
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